Photo and specs courtesy of Track. Reproduced with credit to the maker.
How it moves
Hockey-stick turn (asymmetric core). Dotted is skid, then the turn, then the roll into the pocket. Estimated from the coverstock, finish, core, and differential for a right-handed bowler with medium revs on a house shot. Lane conditions, speed, and layout move all of this.
How much the ball wants to hook, 1 (straight, a spare ball) to 10 (the strongest oil-eaters). The maker publishes no number for this ball, so this is estimated from the coverstock, core, finish, and differential.
Coverstock
Prime Response Pearl
Reactive pearl
Core
Proof
Asymmetric
Factory finish
500, 1000 Siaair / Crown Factory Compound
Color
Black / Smoke Pearl
Released
Not listed
USBC
Approved 2020-08-04
Weights and specs
Weight
RG
Differential
Int. diff
12 lb
2.61
0.042
0.011
13 lb
2.59
0.043
0.011
14 lb
2.54
0.052
0.020
15 lb
2.52
0.052
0.020
16 lb
2.51
0.052
0.020
Surface
Coarse grit
Coarse and fine
Fine grit or polish
500, 1000 Siaair / Crown Factory Compound. Skims the oil and saves its energy for the dry part of the lane: longer skid, later and sharper hook. Polished and pearl balls. Surface changes over games, and a pro shop can take any ball either way with a pad.
Reviews on YouTube
Track Bowling · 2020 · Track Bowling | Proof PearlJR Pro Shop · 2021 · Track Proof Hybrid and Proof Pearl | Bowling Ball Review | BIG DIFFERENCE???Creating the Difference · 2020 · PROOF PEARL EXTENDED AND UNCUT Bowling Ball Review | TruBallReviews
Picked by search for this ball; videos and thumbnails belong to their creators and play on YouTube.
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